[sssss3333]

There's no visible usernames in the app. I'm not sure what good taking over someone's account would do you.

[smt88]

1. Hack someone in your office

2. Hack someone in your home (one of your kids for example)

3. Hack someone in a coffee shop

Generally, when someone thinks they're anonymous and they aren't, bad things are going to happen.

[tedks]

By "hack", you mean "discover the userIDs of users launching the app in your {office/home/coffee shop}." But this does not equate to a deanonymization of ANY past posts necessarily. userIDs are generated on app install, so anyone hoping to be anonymous needs only connect via a VPN to avoid a MITM on that particular connection, post the anonymous secret, and re-install the app. Then any further use of the app will not leak that they posted the secret, and in fact the information has been destroyed.

[woah]

And I'm sure that's exactly what most users will do.

[kibibu]

Did you not read the part in the article about de-anonymizing user ids?

[DonHopkins]

Delete something they posted about you.