I read in japan several apps have the ability to make others know you are safe, like facebook has a 'safe' mark during natural disaster.

Given the nature of briar I think it would be a great addition to have. However I am not sure what would be the best way to implement it.

I thought about 3 possibilities:

1 User can decide themselves whenever to check the 'safe' check (but then it would be too abused I suppose?And might worry people if you don't have 'safe' checked).

2 depending on the location briar could issue an alarm message about a disaster and give the option to check 'safe' (but then briar would have to scan third-party portals and the burden would be on briar not on the user).

3 let the user in private groups the option to create a warning: e.g. 'flood happened in city X please all check safe if you are good' and then users can individually check their status (I think this sounds the best option, although like all other 2 could be abused so maybe give such option only to the creator of the group?.