I think it's pretty annoying to spam friends about services to gain perks but in case you are interested in what services and products I actually use, this is a list you can check out:
Everlane, simple and sleek basics.
Farm to People, small batch food goods delivered to you!
Food52, recipe guides and cute-ass provisions.
Mailchimp, easy to use email client for business, hobbies or your family newsletter.
Square, mobile and web credit card processing.
Venmo, payment system alternative to Paypal.