I deleted it
Just received it on one of our phones-the default phone (the Number that receives all the texts from Verizon). Since we both have the same friends, and that I didn't also receive the text leads me to believe it wasn't a text from a friend; possibly Verizon, themselves?
Another clue is that if we don't reply at all, no more texts will be sent. This isn't consistant with other text apps that allow friends to contact several times. Also, if it came from a friend, that friend's name would appear in the text: "Sandy sent you a message...", or "Sandy is inviting you to download this app..."
Not all text plans are unlimited. The more texts sent, the more money is squeezed from the clients. Also, perhaps this is Verizon's way of showing us which friends on the contact list do not have smartphones; perhaps they assume we might try to talk them into getting one, so that we could play games, text, share Facebook, etc. More money in smartphone purchases and contracts for Verizon.
Another suspicious fact is that if you try to search the ifriendshare app in the app store, you won't find it. But if you type ifriendshare as a dotcom web address, it will take you to the app in the app store. Seems to me that they don't particularly want the common iPhone user to find this app.
I could be waaayyy off base, here, but it appears to me that either Verizon, or the app's DEVS, or both would highly benefit from sending this text. Who knows? Verizon could very well BE the creators of this app.