Were the Longbottom's in Hiding too?

[Tandra]

No: HPFGUIDX 170087

This just came to me and I don't remember if it was stated in any of
the books but since DD had heard the prophecy and knew it could have
been one of the two families were the Longbottom's hidden too? Did
they have a secret keeper? Was this mentioned anywhere?

It just seems odd to me that all this protection was put into place
for the Potters but nothing at all for Neville and his family. If that
was the case why just the Potters then? What information did they have
that lead them to only protect them and not the Longbottoms as well. 

Plus, the entire Order doesn't know about the prophecy so how would DD
have explained the need to hide these two specific families? Or the
need to only hide the Potters? 

If anyone has any answers please share. THX

TKJ :-)