This is a question I remember tossing around eight or nine years ago when I was an analyst tracking the enterprise portal market at Giga Information Group.

Those from the application integration world tended to see portals as empty frameworks (with authentication and customization services) into which apps or data sources could be plugged. But those (like me) that came from from the search and information access world saw a portal as encompassing more functionality in and of itself for collaboration, search and information access. So is the portal an entry point or a destination?

This question hasn’t reared its head in awhile since portal products were mostly subsumed into the application platforms of IBM, BEA and Oracle — as pretty generic portal frameworks. Even SAP’s portal has been mostly a UI to SAP’s apps as opposed to one itself.

But with the advent of social computing, the question seems to be returning. I met with open source portal play Liferay this week, a vendor that is busy adding social software capabilities to its portal. Liferay notes many customers, particularly in Europe, still looking for traditional portal framework capabilities, for the portal to serve as an aggregation point for accessing other apps.

Here in the US, Liferay is seeing more requests for integrated collaboration capabilities, like profiles, wikis, blogs and discussion forums, that are delivered to end users in the portal itself. The company is even toying with out how best to refer to its product in this new world. Is it still a portal?

Liferay isn’t the only portal vendor taking such steps. The BEA AquaLogic User Interaction group (the horribly named result of BEA’s 2005 Plumtree acquisition) has been busy adding social capabilities as well, packaged up in a new 6.5 release announced this week. It’s hard to know what to make of this, given the Oracle acquisition — Mike Gotta goes so far as to ask “Should I Pay Attention to BEA?” and Janus Boye is equally pessimistic about the prospects for BEA’s two portal products. But the AquaLogic group has done a nice job enhancing that portal and Pathways is one of the only enterprise tagging tools on the market (Connectbeam has another).

BEA’s portals aren’t likely to fair well post acquisition because Oracle already has two of its own. But Oracle WebCenter is the one getting the social software enhancements and the one likely to be Oracle’s main pick going forward. SAP and Microsoft are others making portals more social.

What will be interesting to watch is how these portal-based approaches make out in the nascent market for enterprise social software. They’re potentially up against SaaS offerings and on-premise tools that don’t require the portal overhead.

A good example of this is the Clearspace product from Jive Software, which also revved this week to a 2.0 version (and incidentally added customizable start pages to which users can add widgets…sound like the start of a portal?). With these new products, are we eliminating the services of the portal framework – authentication/single sign-on, customization, integration? Or maybe just the portal name?