Stop contacts after 5 consecutive Facebook send failures

[nicpottier]

Facebook doesn't give us super clear error messaging when someone blocks you, but data shows if we stop people after five failures we are very unlikely to stop by mistake.

[cbunicef]

This is a bit pedantic but I think it's important for how we address the issue - this is for U-Report, and based on data from the Global workspace.

So for some RapidPro uses you may never want to stop (no matter how many fails) because it doesn't make sense in the context of the usage that a user would have blocked us.

And for some U-Report workspaces, eg in countries with less internet access, users may fail (without blocking) more frequently because they have internet connection less frequently.

Maybe this could be tunable by workspace?

[nicpottier]

As an added twist, now that Facebook has 24 hour window restrictions we also get the same kind of error when sending then, so that complicates knowing whether a contact has blocked us or we are just trying to send outside a 24 hour window.