This is great and straightforward. Just thought of adding an "s" to e-mail so that the text becomes. 

Twitter

Attn #python and #java developers: free BSD-3 licensed sample codes are now available to make your software systems accept internationalized domains and emails. Get them here and help build an #Internet4All: [LINK to Github source] 

Facebook

Attention #python and #java developers: free BSD-3 licensed sample codes are now available to make your software systems accept new gTLDs and internationalized domains and emails (e.g., .london, marc@société.org, 测试@example.com) . Get them here and help build a more inclusive and multilingual #Internet4All: [LINK to Github source] #HelloWorld