A roundup of tech ratings changes

|By:, SA News Editor

Facebook (FB +1.9%) has been upgraded to Positive by Susquehanna. The upgrade comes as the company begins a news feed video ad test.

H-P (HPQ +1.9%) has been upgraded to Overweight by JPMorgan.

Seagate (STX +1.2%) and Western Digital have been upgraded to Overweight by JPMorgan. Citi upgraded the hard drive giants to Buy last week.

iRobot (IRBT +9.8%) has been upgraded to Strong Buy by Raymond James.

500.com (WBAI -2.3%) has been assigned neutral ratings by Deutsche and Piper on underwriter coverage day.