Blue Calypso, a little-known marketing company, filed suit against Living Social for patent infringement just weeks after accusing Groupon of the same infraction.
The company, which says it provides marketing services for businesses via social media and loyalty rewards services, says Groupon and Living Social has been using its technology.
"As a technology innovator, it is our duty to protect what we have created from illegitimate use," Bill Ogle, CEO of Blue Calypso said in a statement. "The current landscape for social engagement is growing and with that brings interest and need for the platform we developed and operate. It is our plan to monitor for infringing companies and ensure that our assets are protected now and into the future."
Ogle previously served as chief marketing officer at Motorola Mobility, a company which was recently acquired by Google, according to the company's site.
It seems like a strange patent match up, but Calypso points to two of its patents related to a "peer-to-peer advertising" system.
Blue Calypso said this will be the first in "a series" of suits. No word yet on who is next.