Facebook Local - Discover places to go and events happening near you
DocDroid - DocDroid is a service for sharing document and slides.
TechEvents.co - Tech and startup events aggregator
SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
SlideOnline - Share PPT presentations online easily with a free PowerPoint presentation sharing platform