I would agree with the previous post writers. I keep getting messages to download the app from a growing number of people. The number of names listed on the text messages is growing, but all people I do not know or nonspecific (i.e. I know several Jasons, but there is never a last name listed). This seems like a form of spamming at the least, malicious invasion of someone's contacts or tracking their locations in an unwanted manner at the most. Doesn't this violate some part of the app developers agreements within the App store? I am just surprised as someone who has never downloaded the app, Apple would not act on the barrage of texts I am now getting from the app.
From what I have read online, there is some deceptive measures taken within the app to get these number and send the texts, to begin with. People are asked to find other friends using mappen, and the friends you select from your contact list to find in the app are 1. either identified in the app or 2. put on this list of frequent text messages to download the app to find out who is looking for you.
Frustratingly, I have never downloaded the app, because it seems highly suspect to me. But, in the apple app store reporting structure you have to have a history of downloading an app to report it for suspicious activity. I have blocked the numbers as spam in my phone, but the texts seem to be coming from an ever change number, further evidence in my opinion that this app is up to no good.