What could be creative alternatives for word 'Home' on a social network applications that implies as a default space/ a living space or a place where all the updates gather?
What can work is a small representation of your homepage. G+ uses a combination of a house and a feed:
Another common one is the grid icon, used by Facebook, Yelp and many others:
(of course this only makes sense if you have a grid navigation)
So if your homepage has a distinctive layout, this approach might work.
Ask your users. There's a test known as a 'semantic free association' task (or 'freelisting' for meeting room coolness) in which you give a word to someone and ask them to tell you the first n words that come into their heads.
So you would say, 'Home' and they might say, 'safe, base, secure' which gives you options that a) you and other UX ppl might not have thought of and b) are terms actually used by users.
Maybe a kind of personnalised word ('My stream' / 'My Hub', etc.) ?
An interesting fact is that in many countries now the house icon represents the 'Home' item whereas the word for the homepage has nothing to do with a House. For example in France it's Accueil (that could be translated as 'Welcome') but it is quite common to see a house icon for a homepage.
Try something like domain name, if you at the top header of the ux.stackexhange.com, you will see site name icons.
E.g. like UX, face book
View the following site, it's have both features picture as well as site name, when you mouse over on the logo there is home icon.
Home is wrong from an SEO point of view. The recommendation is to use the site's name to enforce branding on search.
For example if the site is called StackExchange.com, the "home" menu option will be StackExchange.
You can consider removing Home altogether, and simply using the app's logo that is on the header by default.
Also, depending on localization, Home does not work everywhere: in Spanish you won't see Hogar as a link to the main page.