Facebook

Unclear

Yes

Yes

"We added protections for Facebook’s implementation of OpenSSL before this issue was publicly disclosed. We haven’t detected any signs of suspicious account activity, but we encourage people to ... set up a unique password."

Instagram

Yes

Yes

YesYes

"Our security teams worked quickly on a fix and we have no evidence of any accounts being harmed. But because this event impacted many services across the web, we recommend you update your password on Instagram and other sites, particularly if you use the same password on multiple sites.”

LinkedIn

No

No

No

"We didn't use the offending implementation of OpenSSL in www.linkedin.com or www.slideshare.net. As a result, HeartBleed does not present a risk to these web properties."

Pinterest

Yes

Yes

YesYes

"We fixed the issue on Pinterest.com, and didn’t find any evidence of mischief. To be extra careful, we e-mailed Pinners who may have been impacted, and encouraged them to change their passwords."

Tumblr

Yes

Yes

YesYes

"We have no evidence of any breach and, like most networks, our team took immediate action to fix the issue."

Twitter

No

Yes

Unclear 

Twitter wrote that OpenSSL "is widely used across the internet and at Twitter. We were able to determine that [our] servers were not affected by this vulnerability. We are continuing to monitor the situation