SNS, does it help?!?!

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Across
  1. 3. A strong and fast-moving stream of water
  2. 4. A formal pronouncement from an authoritative source
  3. 6. The act of participating in pointless activities as an alternative to actually expending effort to fix a problem.
  4. 8. Not needed or useful
  5. 11. Happening or developing gradually or in stages
  6. 13. The action of using vigorous campaigning to bring about social change
  7. 14. An item of additional material added at the end of a publication.
Down
  1. 1. A version of something that differs in some respect from other forms of the same thing.
  2. 2. selfless conceren for the well-being of others
  3. 5. The state of being incapable of producing a desired effect or result in matters of expense.
  4. 7. spread, something like information, widely .
  5. 9. pour a liquid over
  6. 10. Someone who thinks they are helping society when in fact they are not being realistic and helpful at all
  7. 12. Based on observations or experiences rather than theory or pure logic