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The past few years have witnessed millions of credit/debit cards flowing through the underground economy and ultimately causing significant financial loss. Examining key underground economy sellers has both practical and academic significance for cybercrime forensics and criminology research. Drawing on social media analytics, we have developed the AZSecure text mining system for identifying and profiling key sellers. The system identifies sellers using sentiment analysis of customer reviews and profiles sellers using topic modeling of advertisements. We evaluated the AZSecure system on eight international underground economy forums. The system significantly outperformed all benchmark machine-learning methods on identifying advertisement threads, classifying customer review sentiments, and profiling seller characteristics, with an average F-measure of about 80 percent to 90 percent. In our case study, we identified the famous carder, Rescator, who was affiliated with the Target breach, and captured important seller characteristics in terms of product type, payment options, and contact channels. Our research leverages social media analytics to probe into the underground economy in order to help law enforcement target key sellers and prevent future fraud. It also contributes to our understanding of the use of information technology in detecting deception in online systems.

Study of historical and fresh collections from the Longmyndian Supergroup sheds new light on Ediacaran microbial communities and taphonomy. First reported by Salter in 1856, and noted by Darwin in the Origin of Species in 1859, a range of macroscopic bedding plane markings are already well known from the Longmyndian supergroup. Here we report filamentous and sphaeromorph microfossils, variously preserved as carbonaceous films, by aluminosilicate permineralization and as bedding plane impressions. This supports a long-suspected link between wrinkle markings and microbes, and draws further attention to our hypothesis for a taphonomic bias towards high-quality soft tissue preservation in the Ediacaran Period.

Planning Board, Town Office, 571 Lakeview Drive. 6:30 p.m. Planning Board, Town Office, 26 Gardiner St. 6 p.m. Lithgow Public Library at Ballard Center, 6 East Chestnut St. lithgow.lib.me.us. [bullet] Toddler Time, youth services, songs, stories and nursery rhymes, free. 10 a.m. [bullet] Drop-in Tech Help, 10-11 a.m. Buker Community Center, 22 Armory St. 620-8220. [bullet] Cribbage, 12:30 p.m. [bullet] Augusta Recreation, 3:30 p.m. Rotary Club, Senator Inn and Spa, 284 Western Ave. 7:15 a.m. Job Corps training information for women 16-24, for those who want technical training, a high school diploma or general education development certificate or driver's license.

7 p.m. Planning Board, Town Office, 571 Lakeview Drive. china.govoffice.com. 6:30 p.m. Selectmen, Municipal Building, 153 Farmington Falls Road. farmington-maine.org. 6:30 p.m. Planning Board, Town Office, 26 Gardiner St. 6 p.m. Kennebec Sanitary District, 401 Water St. 5:30 p.m. Lithgow Public Library at Ballard Center, 6 East Chestnut St. lithgow.lib.me.us. [bullet] Drop-in Tech Help, 10-11 a.m. [bullet] Toddler Time, youth services. 10 a.m. Buker Community Center, 22 Armory St. 620-8220. [bullet] Cribbage, 12:30 p.m. [bullet] Augusta Recreation, 3:30 p.m. Rotary Club, Senator Inn and Spa, 284 Western Ave. 7:15 a.m. Job Corps training information for women 16-24, for those who want technical training, a high school diploma or general education development certificate or driver's license. CHP/Job Corps Office, 22 Armory St. 10 a.m. Clay Play, Children's Discovery Museum, 171 Capitol St. 11 a.m. Augusta Food Cupboard, serving Augusta and Manchester residents, 9 Summer St. 5:30 p.m. Addie's Attic clothing bank, free clothing, donation accepted, St. Mark's Episcopal Church, 9 Summer St. 12:30 p.m. Kennebec Valley Toastmasters, Augusta City Center, 16 Cony St. toastmasters.org. 5:45 p.m. Veterans of Foreign Wars Auxiliary 887, VFW Pine Tree Post 887, 509 Leighton Road. 623-9658.

palermo.lib.me.us. 10 a.m. Celebrate Recovery, Palermo Christian Church, 322 Branch Mills Road. 6-8:30 p.m. Palermo Historical Society, Worthington House, 54 North Palermo Road. 7 p.m. Current Events Club, Randolph United Methodist Church, 16 Asbury St. neumc.org. 1 p.m. Golden Oldies Senior Center, 314 Front St. 737-2161. [bullet] Living Well for Better Health series, 9-11:30 a.m. [bullet] Qi Gong, 11:45 a.m. [bullet] Bingo, 1-3 p.m. American Legion, American Legion Post 132, Carding Machine Road. 737-2113.

Augusta Chapter of National Association of Active and Retired Federal Employees, $13 luncheon. Pittston Literary and Historical Society, annual meeting and election of officers.

Sidney Grange, 2986 Middle Road. 1-4 p.m. Walking, Skowhegan Community Center, 39 Poulin Drive. 6 a.m. Food Cupboard, Trinity Evangelical Free Church, 12 McClellan St. 9-11 a.m. Skowhegan Rotary, Heritage House Restaurant, 182 Madison Ave. 12:15 p.m. Unity Area Rotary, Crosstrax Deli, 215 Depot St. 4:30 p.m. Walking, Alfond Youth Center, 126 North St. 6 a.m. South End Neighborhood Association, KVCAP Transportation & Energy Building, 97 Water St. 7 a.m. Quilts and crafts, $1, Spectrum Generations Muskie Community Center, 38 Gold St. 9-11 a.m. Online job search lab, Waterville Library, 73 Elm St. 10 a.m. Central Maine Garden Club Waterville Christmas luncheon, guest speaker Jeff Karter, Waterville Florist owner, will speak on Care of Christmas Plants.