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Yahoo! Not Done Acquiring (Correction)

Tickers in this article: YELP YHOO
This story was originally published June 5, and has been corrected to reflect the fact Gowalla was acqui-hired by Facebook, in 2011, then shut down. TheStreet regrets this error.

NEW YORK (TheStreet) -- Apparently all of that cash on Yahoo!'s balance sheet is burning a hole in Marissa Mayer's pockets, because she's not done acquiring companies.

Despite having just spent $1.1 billion to acquire Tumblr and rumors that it has its eye on Hulu, Yahoo! very well could be looking to getting into the check-in space, according to CFO Ken Goldman.

Goldman spoke at a investment conference, and continued to sound the horn that Yahoo! is not done acquiring companies in the mobile space. He noted "localization of the space," which sounds an awful lot like check-in services.

I've opined before that Yahoo! would acquire Yelp , which not only lets people check in to restaurants, stores and local businesses, but also provides search and content.

Mayer has continuously alluded to the fact that Yahoo! needs "more personalized content and increased product innovation" to get the Internet giant back on track for Display revenue growth. Yelp isn't profitable yet, but revenue growth is soaring, up 68% year-over-year, according to Yelp's latest earnings report.

At a market cap approaching $1.8 billion, Yelp is now probably too big for Yahoo!, especially after the Tumblr acquisition, but that doesn't mean there aren't other alternatives.