Hiring Lessin may have been an important driver for the acquisition. "We can confirm that we recently completed a small talent acquisition for drop.io and acquired most of the company's assets. We're thrilled that Sam Lessin will be joining us at Facebook," Facebook said in a statement.

In its blog post, drop.io said that "as of this week," people won't be able to create new drops. Until Dec. 15, users will be able to download content from drops they've already created. After that, drop.io will delete all data in drops, it said.

Drop.io is free up to 100 MB of storage, but some people pay to get more storage. Nov. 15 will be the last date when drop.io will charge users for extra storage, and those paid users will also lose all their data after Dec. 15.

The IDG News Service