my friends wish to sponsor me

The fastest way is always a person coming to the US for a personal visit. Whether it is the easiest depends upon the individual's immigration history, bonds in the home country, and reason for visiting this country. An employer/employee sponsorship is slower because it usually entails some type of petition being drawn up and approved prior to the individual being able to come to the States. Depending upon the type of employment sponsorship and how it looks to an immigration official, coming to the US through this method might or might not be easier than through a personal visit. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence

If you merely wish to visit, you do not need a sponsor.  If you want to work here, or immigrate, you will need a relative or an employer to sponsor you.