The US Federal Trade Commission has reached out to Google Inc and Twitter in an investigation into Facebook Inc's $1 billion acquisition of photo-sharing service Instagram, a source familiar with the probe told Reuters.
It was not immediately clear what specific information the FTC was looking for, the source said. The Commission automatically initiates a review of any acquisition of significant size.
The acquisition of the top photo-sharing service on the Internet is a crucial part of Facebook's strategy to bolster its mobile offerings, at a time when consumers are increasingly accessing the Internet through smarpthones.
Facebook had said it hopes to complete the deal -- the largest in Facebook's history -- in the second quarter, but some observers think that may be an ambitious target, given the size of the deal and Facebook's status as the world's No.1 Internet social network with roughly 900 million users.
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