A recent example is "willhaben", it's an Austrian classifieds website (like craigslist), and you can use it to message sellers/buyers. It would be useful to get

A recent example is "willhaben", it's an Austrian classifieds website (like craigslist), and you can use it to message sellers/buyers. It would be useful to get push notifications on my phone when someone replies to my messages, but since they send spam, I deleted the app.