Many people like to fundraiser money for  charities, causes and other reason. Now through social media it make is seem much more appealing because you have a vast audience.  PayPal has made it easier to put a "Donate" button on you site.  PayPal has a direct link were you can customize your button and add other options like a subscriber, one time or recurring  donations.  Here is the link  Donation Buttons - PayPal.