Police say 22-year-old Corey Jackson of East Stroudsburg would use the free classifieds site Craigslist to find his victims.
Police say Jackson posed as a buyer interested in jewelry and stole expensive rings from the sellers, and offered the sale of a computer but took the cash then wrestled the laptop back.
Jackson is in Northampton County Prison under $75,000 bail on charges of robbery, theft, and related counts.
He also faces charges in Philadelphia in a robbery June 18, when police said he responded to an online ad, doused a man with pepper spray and stole a $14,000 diamond ring from him.
Information from: The Morning Call