After Google chat services go down for many users for about three hours, some find they actually have to talk to people in person.
Yahoo's blogging network said it had trouble with "intermittent errors" for several hours.
Outages have been a persistent problem for the messaging app, but the latest was one of the longest and biggest, says the company's founder.
A planned server maintenance job went awry because of a "subtle bug" in an upgrade script - but users' files were never at risk, the company says.
The website of cloud storage service Dropbox went down briefly on Friday night, with hackers claiming responsibility.
The file-sync company fixes some of its Friday service troubles, but it's taking time to clear out troubles for people using the service, and photo sharing is disabled.
A site that houses more than 1.4 million bitcoin wallets has been down for more than 16 hours, but says users still have control over their virtual money.
The photo-hosting site crashed for some users this morning, adding to Yahoo's service woes.
Yahoo has apologised for an outage to its Yahoo Mail service that has lasted since Tuesday morning UK time.
The e-mail service hits day two of its partial outage, and the company promises to restore access by 3 p.m. PT.