Recent term coined to describe volunteering done in small chunks of time, even in minutes. While micro-volunteering can be done in various ways, it most often is a sub-set of virtual volunteering and is done online or via smartphone.

I Really Want to Know: What’s Going on Out There?, Susan J. Ellis, Energize Hot Topic, 2014
Civic Engagement and the Internet: Online Volunteers, Mary C. Joyce
posting to Internet & Democracy Blog, Nov. 2007 -- note discussion of possible underutilization of willing online volunteers.
Days, Hours and Minutes of Service - Enough Is Enough, Susan J. Ellis, Energize Hot Topic, 2009
Extra, Extra! Ben Rigby talks micro-volunteering and community, 2010
online interview posted at NetSquared
Micro-volunteering: worth the hype?, Heather Sturgess, nfpSynergy Blog, 2016
Microvolunteering Is Volunteering, Jayne Cravens, 2011

Jayne's response to the Sparked Blog post of Ben Rigby on Microvolunteering Is Not Volunteering

Orange offers microvolunteering mobile app, UK Fundraising, 2011

Orange is a UK mobile telephone company.

Selections from Volunteer Engagement 2.0, Wiley and VolunteerMatch, 2015
Virtual Volunteering Revisited, Susan J. Ellis, Energize Hot Topic, 2014
Virtual Volunteers: How to Keep Engagement with Micro-volunteering, 2010
Series of posts to the TechSoup Discussion Forum
Why Microvolunteering Is Not Virtual Volunteering, Ben Rigby, 20110
and see the response: Microvolunteering Is Virtual Volunteering, blog post by Jayne Cravens
Aimed at charities and nonprofits interested in exploring the world of microvolunteering. , 2011, pp. 42
"Donate Your Brain!" Microvolunteering Project of Tech Soup
Great example of how to create and run a micro-volunteering project.
We Are What We Do

A UK-based site that "creates stuff that makes it easier for people to do small, good things everyday," which they call "actions."

No tips have been recorded yet.