Here's an easy way you can make a difference. Check out Everyclick.com. It's just like other search engines but every time you use it, you raise money for charity. It's free to use as search engines get their revenue from advertisers. Everyclick claims to allocate 50% of its gross revenue to charity each month.
You can also choose a range of UK charities to support. The search engine below is configured to give money to Oxfam GB. I've noticed it's quite clever at filtering out adult content too! :) Make a difference by remembering to use everyclick.com as your search engine.