Virtual volunteering - volunteers providing service via a computer, smart phone, tablet or other networked advice - presents a great opportunity for companies to expand their employee philanthropic offerings and corporate social responsibility endeavors.Through virtual volunteering, some employees will choose to help organizations online that they are already helping onsite. Other employees who are unable to volunteer onsite at a nonprofit or school, for whatever reason, will choose to volunteer online because of the convenience.Here is a long list of what virtual volunteering looks like.Companies are already allowing employees to volunteer online from the workplace, either on breaks (off-the-clock) or as part of an official time-off-to-volunteer policies - and have been for decades. One of the first was Hewlett-Packard, which established an online mentoring program back in the 1990s, one of the first-ever, that brought together employees of HP together with high school students.Here is more guidance for corporations on how to encourage virtual volunteering among employees, and what to do if you want to make virtual volunteering a formal part of your employee volunteering program.