Facebook - Needs little explanation. Growing a little older in terms of demographics. Visual and video content working well. Tends to get higher engagement than Twitter.

Twitter - The other main channel. Especially useful for networking and news distribution. Powerful if senior individuals engage.

Instagram - Huge growth channel for younger audiences. Entirely visual or video. Smartphone recordings can be just as engaging as messages. Currently no click through functionality, more a brand and campaign awareness channel at present.

Youtube - If (a big, for many charities) you have budget or ability to generate videos, then this channel can generate huge engagement for campaigns. Has its own search ecosystem.

Pinterest - Another visual channel. Useful for cataloguing ideas - For example, the National Trust's 50 Things To Do Outdoors. Back links can be very useful. One to leave unless you can generate good quality images. Attracts more of a female audience.

LinkedIn - The business network channel often under utilised by charities. Engage with potential donors and charity peers. Especially powerful if employees post with referrals to their charity. See this example from CLIC Sargent.

Google+ - Less popular, but the community and groups function can be useful.

Snapchat - It's still early days with this channel as charities (and businesses) experiment and Snapchat expands its advertising functionality. There are some indicators that early charity adopters are having some success.