Welcome! I tried to incorporate ideas of social unity and growth both of the cause and the ROI of the contributor. Keep in mind that color palettes are easily changed.
#26 | Unity of a group for a cause. Forms and "S" as well #27 and #28 | Many voices unify for a singular cause. #28 | A community is united for a cause and the arrows and human "bar" graph show growth and ROI.
Thank you for submitting these! Entry #28 I think may be the best, although I think the emphasis should not be on "social" - either none of the words or "Innovation" may seem more appropriate. The Summit is geared more towards bringing companies (F500, foundations, social entrepreneurs) together, than individual people, so with that in mind a graphic focusing more on ideas or sharing or innovation may be better than one with people figures.