Summary Box: Facebook filing lifts recent IPOs

HALO EFFECT: Facebook’s long-awaited IPO filing lifts the stocks of many Internet companies, including recent laggards Zynga and Groupon.

NEW HIGH: Zynga Inc. was getting the best ride on Facebook’s coattails. Its stock jumped nearly 17 percent to set a new high at $12.39. Almost all of Zynga’s revenue comes from addictive games played on Facebook.

NOT SO FAST: Analysts said the halo effect may fade because some companies basking in Facebook’s glow just aren’t as financially sound as the world’s largest social network.